Enhanced Piezoelectricity in Poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) Random Terpolymers with Mixed Ferroelectric Phases

• DOI: 10.1021/acs.macromol.1c02302
• Publication Date: 2022-03-22T17:21:13Z
• Authors: Zhubing Han; Yang Liu; Xin Chen; Wenhan Xu; Qing Wang
• Keywords: Chlorotrifluoroethylene; Ferroelectric Polymers; Gyroid

Piezoelectric polymers are attractive as next-generation flexible, wearable, and implantable electronic materials for energy, sensor, medical applications. Here, we report the enhancement of longitudinal piezoelectric coefficients (d33) poly(vinylidene fluoride) (PVDF)-based ferroelectric via synthesis characterization difluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] terpolymers with coexisting mixed normal relaxor phases. Specifically, terpolymer a composition VDF/TrFE/CTFE = 64.5/33.1/2.4 mol % exhibits d33 −55.4 pC/N, corresponding to an 85% increase compared well-known P(VDF-TrFE) 65/35 copolymer. The microstructures, chain conformations, Curie transitions, crystal structures have been investigated function CTFE content. structural conformational analyses show that incorporation into facilitates formation phase. maximum is present in content ranging from 1.7 5.0 %. A further concentration renders without polar phase transition induced by varying evidenced dielectric electromechanical characterizations. This work demonstrates new modification approach improve piezoelectricity polymers.